High quality and durable and reusable. Looks fashion and compact. Low light amorphous silicon solar cells. This device has six functions: compass, altimeter, barometer, thermometer, weather forecast and time display. Time with hour, minute, second, 24 hours format clock display. Compress: 4-bearing mode display and magnetic declination setting. Next 12 to 24 hours weather forecast. All functions are displayed on LCD screen with super bright LED backlight. Easy to use and easy to carry with this detachable string included. Uses 3.6v li-ion rechargeable battery. Ideal for outdoor activities.